refactor: massive USRPFP overhaul (#3)

This repo completely overhauls how USRPFP works. Some changes include:
- Deleted some leftover files
- Edited README.md a bit
- Avatars and badges are now stored in `db/data.json`
- CSS file (`db/dist.css`) is automatically generated by a GitHub
workflow

If you have questions, lmk

.github/scripts/convert/index.mjs

@@ -0,0 +1,39 @@
+import { readFile, writeFile } from "fs/promises";
+import { join } from "path";
+
+console.time("Done");
+
+console.log("Reading avatarsdatabase.css...");
+const avis = (await readFile(join("../../", "avatarsdatabase.css"), "utf8"))
+  .replace(/\r/g, "")
+  .split("\n");
+
+const imageMatcher = /url\((?:'|")([^'"]+)(?:'|")\)/;
+const avatarMatcher = /^\/\* Custom avatar for ([0-9]+) \*\/$/;
+const badgeMatcher = /^\/\* Custom badge for (.*?) \*\/$/;
+
+const avatars = {};
+for (let i = 0; i < avis.length; i++) {
+  const l = avis[i];
+  const id = l.match(avatarMatcher)?.[1];
+  if (id) avatars[id] = avis[i + 2].match(imageMatcher)[1];
+}
+
+const badges = {};
+for (let i = 0; i < avis.length; i++) {
+  const l = avis[i];
+  const username = l.match(badgeMatcher)?.[1];
+  if (username) badges[username] = avis[i + 10].match(imageMatcher)[1];
+}
+
+await writeFile(
+  join("../../", "db", "data.json"),
+  JSON.stringify(
+    {
+      avatars,
+      badges,
+    },
+    undefined,
+    4
+  )
+);